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Applied Physics 2022
超临界态二氧化碳直通式梳齿密封数值研究
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Abstract:
超临界态二氧化碳(Supercritical carbon dioxide, sCO2)梳齿密封技术是一项关系到sCO2先进动力系统中旋转机械运行高效、稳定的关键技术。为研究sCO2工质在梳齿密封内的流动特性，本文使用Fluent对实验中的梳齿密封进行了数值模拟，实验工况涵盖CO2的气相以及超临界相，共计18组。利用实验数据评价了不同湍流模型对计算的影响，分析了数值计算得到的密封内的流场分布以及能量转化过程。结果表明：本文提出的数值模型可以模拟sCO2工质在梳齿密封中的流动过程，在所研究的三种湍流模型中RNG k-ε模型的计算结果与实验数据吻合最好，其最大误差约为21.71%，平均误差约为7.43%。
The supercritical carbon dioxide (sCO2) labyrinth sealing technology is a critical technology related to the efficient and stable operation of rotating machinery in the sCO2 advanced power system. In order to study the flow characteristics of sCO2 in the see-through labyrinth seal, Fluent was used in this paper to simulate seals in the experiment. The experimental operating conditions include the supercritical to the gas phase of CO2, totaling 18 sets. The influence of different turbulence models on the calculation was evaluated by the experimental data, and then the flow field and energy conversion process in the seal were analyzed. The results show that the numerical model in this paper is capable of simulating the flow process of sCO2 through the seal. Among the three turbulence models studied, the results of the RNG k-ε model agree best with the experimental data, with a maximum error of about 21.71% and an average error of about 7.43%.
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